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(No Model.)

I J. F. & J. H. ALLEN SEOTIONAL BOILER. No. 347,859. Patented Aug. 24,1886 Fag. 2/.

WITNESSES: l/VVE/VTOR .64.: 4'52 44) ATTORNEY ilNiTED STATES PATENTOFFICE.

JOHN F. ALLEN AND JOHN H. ALLEN, OF NEW YORK, N. Y.

SECTIONAL BOILER.

SPECIFICATION forming part of Letters Patent No. 347,859, dated August24, 18 86.

' Application filed May 5, 1886. Serial No. 201,142. (No model.)

To aZZ whom it may concern.-

Be it known that we,-JOHN F. ALLEN and JOHN H. ALLEN, both of the cityof New York, county and State of New York. have invented a new andImproved Sectional Boiler, of which the following specification is afull, clear, and exact description.

Our invention relates to sectional-tube boilers in which the violentcirculation of water among the tubes is prevented; and the inventionconsists in the various elements of improvement hereinafter more fullypointed out.

In the accol'npanying drawings, Figure 1 is a side view of our improvedboiler with the mason-work removed. Fig. 2 is an end view of the same.

The letters a a, &c., b b, &c., c c, &c., d d, &C., e e, &c., representfive superposed series of tubes, the tubes of each series being placedside by side and above the tubes forming the next series. All the tubesof each superposed series are connected at their upper ends bytransverse drums A B CD E, as shown. Every vertical set of tubes or b cd ethat is, every set formed from one tube of each superposed series andplaced above or below the tubes of the next series-are connected attheir lower ends by communicating chambers a n 11. a n, as shown.. Thesechambers form aseries of vertical rows or headers, and all the upperchambers are again connected with each other by nipples, and thelowerchambers are connected to a drum, 8, and in this way each chamber is ineither direct or indirect communication with each of the other chambers,thus establishing communication between the lower ends of all the tubes.

t is a feed-pipe connected to one of the outer chambers of the top row,and s is a drum connected to the chambers of the bottom row, andprovided with blow-off pipe P. The transverse drums A B O D E areconnected through pipes A B O D t with asteam-drum, H, the ends of saidpipes projecting some distance into said steam-drum to obtain some spacein the lower part of the steam-drum for the collection of accumulatedwater.

:0 is apipe connecting the lower part of steamdrum H with one of thetransverse drums E, to allow the accumulated water to return.

J is the steam-outlet pipe to conduct the generated steam to any partdesired.

.from the vertical rows.

' as it rises.

The whole plant of pipes, drums, and chambers, with the exception of thesteam-drum H, is placed in mason-work \V, in which the firegrate bars Gare built. The gases and smoke escape at the rear end, as shown at K.

L L are openings closed by suitable doors, and located in the back andsidesof the walls, to gain admittance to the interior.

Instead of connecting feed-pipe t to the upper row of chambers, a drum,2;, may be placed into the inside of the mason-work, as shown by dottedlines in Fig. 1. In this case the pipe 15 from the feed-pu mp isconnected to the drum, and the drum is connected to the upper row ofchambers. A suitable connection is in this case made between the top ofthe drum 1) and the'steam-drum H. The steam generated in the severaltubes to b c (1 6 will escape from the upper ends of said tubes intotheir respective transverse drums A B C D E, and from there into thesteam-drum H. The water is supplied to the tubes at their lower endsonly through their chambers. At the upper ends of the tubeswater-connections exist only between the tubes of each of the superposedrows, but no water-connections exist between the vertical rows, and thusthe several superposed rows will be perfectly independent At the sametime, as each row is supplied only from the lower end, the temperatureof water at the lower ends of all the tubes below and at the back of thebridge-wall y will only be equal to the temperature of water as suppliedby the feedpump or feed-drum 1;, while at the upper end of the tubes thetemperature may rise to about 300 to 400 Fahrenheit. The water fed .intothe tubes is in the exact proportion as it is converted into steam, andis gradually heated Thus, as the water in the uppermost row of tubes isleast affected by the heat, it will generate the least amount of steam,and consequently the least quantity of water will be supplied to it. Theother rows will evaporate and receive water in proportion to theirgreater or less vicinity to the fire. The waterlevel is supposed to beabout in the center line of the pipes or drums A B G D E.

Iclaim as my invention 1. The combination, in a boiler, of the tubesarranged in a series of superposed rows, with chambers that establish acommunication between all the tubes at their lower ends, andrespectively, upper ends of tubes a a, b b, c c, 10 with drums thatconnect separately all the and with the pipes A B O, drum H, feedtubesof each superposed row at their upper pipe 1, drum 8, blow-01f pipe P,outlet-pipe J,

7 ends, while the several superposed rows are and grate-bar G,substantiallyas specified.

5 disconnected at such upper ends, substantially JOHN F. ALLEN. asspecified. JOHN H. ALLEN.

2. The combination of tubes a a, b b, c c with Vitnesscs: I

chambers 01/ n", connecting lower ends of the HENRY E. ROEDER, tubes a bc, and with drums A B C, connecting, F. V. BRIEsEN.

